package org.huys.xml;

/*
 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit http://www.davidflanagan.com/javaexamples2.
 */

import java.io.PrintWriter;
import java.io.File;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;


/**
 * Output a DOM Level 1 Document object to a java.io.PrintWriter as a simple XML
 * document. This class does not handle every type of DOM node, and it doesn't
 * deal with all the details of XML like DTDs, character encodings and preserved
 * and ignored whitespace. However, it does output basic well-formed XML that
 * can be parsed by a non-validating parser.
 */
public class XMLDocumentWriter {
  PrintWriter out; // the stream to send output to

  /** Initialize the output stream */
  public XMLDocumentWriter(PrintWriter out) {
    this.out = out;
  }

  /** Close the output stream. */
  public void close() {
    out.close();
  }

  /** Output a DOM Node (such as a Document) to the output stream */
  public void write(Node node) {
    write(node, "");
  }

  /**
   * Output the specified DOM Node object, printing it using the specified
   * indentation string
   */
  public void write(Node node, String indent) {
    // The output depends on the type of the node
    switch (node.getNodeType()) {
    case Node.DOCUMENT_NODE: { // If its a Document node
      Document doc = (Document) node;
      out.println(indent + "<?xml version='1.0'?>"); // Output header
      Node child = doc.getFirstChild(); // Get the first node
      while (child != null) { // Loop 'till no more nodes
        write(child, indent); // Output node
        child = child.getNextSibling(); // Get next node
      }
      break;
    }
    case Node.DOCUMENT_TYPE_NODE: { // It is a <!DOCTYPE> tag
      DocumentType doctype = (DocumentType) node;
      // Note that the DOM Level 1 does not give us information about
      // the the public or system ids of the doctype, so we can't output
      // a complete <!DOCTYPE> tag here. We can do better with Level 2.
      out.println("<!DOCTYPE " + doctype.getName() + ">");
      break;
    }
    case Node.ELEMENT_NODE: { // Most nodes are Elements
      Element elt = (Element) node;
      out.print(indent + "<" + elt.getTagName()); // Begin start tag
      NamedNodeMap attrs = elt.getAttributes(); // Get attributes
      for (int i = 0; i < attrs.getLength(); i++) { // Loop through them
        Node a = attrs.item(i);
        out.print(" " + a.getNodeName() + "='" + // Print attr. name
            fixup(a.getNodeValue()) + "'"); // Print attr. value
      }
      out.println(">"); // Finish start tag

      String newindent = indent + "    "; // Increase indent
      Node child = elt.getFirstChild(); // Get child
      while (child != null) { // Loop
        write(child, newindent); // Output child
        child = child.getNextSibling(); // Get next child
      }

      out.println(indent + "</" + // Output end tag
          elt.getTagName() + ">");
      break;
    }
    case Node.TEXT_NODE: { // Plain text node
      Text textNode = (Text) node;
      String text = textNode.getData().trim(); // Strip off space
      if ((text != null) && text.length() > 0) // If non-empty
        out.println(indent + fixup(text)); // print text
      break;
    }
    case Node.PROCESSING_INSTRUCTION_NODE: { // Handle PI nodes
      ProcessingInstruction pi = (ProcessingInstruction) node;
      out.println(indent + "<?" + pi.getTarget() + " " + pi.getData()
          + "?>");
      break;
    }
    case Node.ENTITY_REFERENCE_NODE: { // Handle entities
      out.println(indent + "&" + node.getNodeName() + ";");
      break;
    }
    case Node.CDATA_SECTION_NODE: { // Output CDATA sections
      CDATASection cdata = (CDATASection) node;
      // Careful! Don't put a CDATA section in the program itself!
      out.println(indent + "<" + "![CDATA[" + cdata.getData() + "]]"
          + ">");
      break;
    }
    case Node.COMMENT_NODE: { // Comments
      Comment c = (Comment) node;
      out.println(indent + "<!--" + c.getData() + "-->");
      break;
    }
    default: // Hopefully, this won't happen too much!
      System.err.println("Ignoring node: " + node.getClass().getName());
      break;
    }
  }

  // This method replaces reserved characters with entities.
  String fixup(String s) {
    StringBuffer sb = new StringBuffer();
    int len = s.length();
    for (int i = 0; i < len; i++) {
      char c = s.charAt(i);
      switch (c) {
      default:
        sb.append(c);
        break;
      case '<':
        sb.append("&lt;");
        break;
      case '>':
        sb.append("&gt;");
        break;
      case '&':
        sb.append("&amp;");
        break;
      case '"':
        sb.append("&quot;");
        break;
      case '\'':
        sb.append("&apos;");
        break;
      }
    }
    return sb.toString();
  }
  
  public static void main(String[] argv) throws Exception {
    Document doc = null;
    String filename = "name.xml";

    Source source = new DOMSource(doc);

    File file = new File(filename);
    Result result = new StreamResult(file);

    Transformer xformer = TransformerFactory.newInstance().newTransformer();
    xformer.transform(source, result);
  }
}

           